Compute derivatives for nonparametric regression models

July 5, 2018
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Compute derivatives for nonparametric regression models

SAS enables you to evaluate a regression model at any location within the range of the data. However, sometimes you might be interested in how the predicted response is increasing or decreasing at specified locations. You can use finite differences to compute the slope (first derivative) of a regression model.

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When will women control state legislatures?

July 2, 2018
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In FiveThirtyEight's Significant Digits section, they recently mentioned that nine states could potentially have 50% or more females in their legislature after the upcoming election. My first thought - I need to see some graphs! They linked to a New Yo...
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The Internet of Snacks: SnackBot data and what it reveals about SAS life

July 2, 2018
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The Internet of Snacks: SnackBot data and what it reveals about SAS life

At SAS, we love data. Data is central to our corporate vision: to transform a world of data into a world of intelligence. We're also famous for enjoying M&Ms, but to us they are more than a sweet snack. They're also another source of data. My colleague Pete Privitera, with

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Ranking US presidents

July 2, 2018
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Ranking US presidents

Which president of the United States is ranked the greatest by presidential historians? This article visualizes the results of the 2018 Presidential Greatness Survey, which was created and administered by B. Rottinghaus and J. Vaughn. They analyzed 166 responses from experts in political science who ranked the 44 US presidents

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Custom Maps in SAS Visual Analytics: My Neighborhood

June 29, 2018
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The Geo Map Visualization has several built-in geographical units, including country and region names and codes, US state names and codes, and US zip codes. You can also define your own geographic units. This paper describes how to identify any geogra...
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What’s the electricity bill for your air conditioner this summer?

June 28, 2018
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During these hot summers in the southern US, many people regard Willis Carrier (the man who invented modern air conditioning) as a saint. But along with the comfortable indoor temperatures comes the high electricity bill at the end of the month. And how much does the electricity cost? That's a difficult

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Reduced models: A way to choose initial parameters for a mixed model

June 27, 2018
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Reduced models: A way to choose initial parameters for a mixed model

This article describes how to obtain an initial guess for nonlinear regression models, especially nonlinear mixed models. The technique is to first fit a simpler fixed-effects model by replacing the random effects with their expected values. The parameter estimates for the fixed-effects model are often good initial guesses for the

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Coming to America … from Mexico

June 26, 2018
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One of my favorite Eddie Murphy movies when I was growing up was Coming to America. And speaking of coming to America, there's been a lot in the news recently about people doing just that. So I thought I'd use my SAS skills to help people wanting to co...
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Use a grid search to find initial parameter values for regression models in SAS

June 25, 2018
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Use a grid search to find initial parameter values for regression models in SAS

When you fit nonlinear fixed-effect or mixed models, it is difficult to guess the model parameters that fit the data. Yet, most nonlinear regression procedures (such as PROC NLIN and PROC NLMIXED in SAS) require that you provide a good guess! If your guess is not good, the fitting algorithm,

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